JPS636628A - Information recording control system - Google Patents

Abstract

PURPOSE:To avoid increase of the number of working alternate areas by updating data in a data updating mode including a defective block to which an alternate area is allocated by the preceding data writing action. CONSTITUTION:In an erasion enable optical disk system, an optical disk driver 3 contains an erasion enable optical disk 4 to carry out the erasion, writing and reading, etc. An optical disk controller 2 receives an instruction from a CPU 1 of a host device and controls the operation of the driver 3. Then an alternate area is read when the disk 4 is loaded to the driver 3 and an alternate control table is produced on an internal IC memory of the controller 2. If a defective block is produced while an initial writing track is kept under a write mode, a writing operation is applied to the alternate area to relive the defective block and the corresponding alternate information is registered to said control table. In a data updating mode data are replaced including the defective block and the access frequency is reduced to the alternate area.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording control method for an information recording device, and particularly to an information recording control method suitable for an optical disk system capable of rewriting (erasing) OJ.

[Conventional technology]

In conventional optical discs, information was recorded by irradiating the recording film with laser light to form minute bits, so it was impossible to update the information in the area where -degree +/lI information was recorded. It was impossible.

Further, as disclosed in Ushikai No. 59-165207, when a defective block is detected during recording of information, the information of the block is recorded in a spare area and repaired.

In addition, in conventional magnetic disk drives, etc., a spare area is allocated to a defective area, and a pointer to the spare area is written in the defective area. Processes such as access were performed.

[Problem that the invention seeks to solve]

None of the above conventional techniques injects new information into defective areas. However, optical disks perform high-density recording, and temporary defects may occur due to the adhesion of dust or other particles in the disk. If new fw information is not sent again for such temporary defects, a normal block may become a defective block when updating data, and the number of defective blocks and the number of replacement areas used will become monotonous. The problem is that it increases.

Therefore, an object of the present invention is to reduce the increase DO in the number of defective blocks and the number of spare areas used.

〔problem! :5. [Means for solving the problem] The above purpose is to update bad blocks when updating data, and if the bad block can be updated normally, to reuse the block as a normal block from now on, and to update the data. This is achieved by erasing spare areas that are no longer needed.

[Effect]

In data update, the spare area 'e,!' is replaced by the previous data write operation. The data is updated including the defective programs assigned to rlI. As a result, if the defective block is determined to be a normal block, the block can be treated as a normal block from now on, the previously allocated spare area becomes unnecessary, and the unnecessary spare area is erased.

This unnecessary spare area can be allocated to a newly generated defective block later.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. Second
．． Figure 46 illustrates the principle of the invention.

FIG. 6 shows an example of the configuration of the erase oTI￥@optical disk Φ system, in which the optical disk drive device 3 is equipped with an erasable optical disk 4, and the erasable optical disk 4 is erased, written, and Performs operations such as reading. Cf
'Ut is a host device of the optical disk device. The optical disk control device 2 receives and receives commands from the CPU 1, which is a host device, and controls the operation of the optical disk drive device 3.

FIG. 2 is a diagram showing the Toraref format on the erasable OT optical disc 4. As shown in FIG. It is assumed that the track is provided in a spiral shape on the disk 4 and is divided into a plurality of sectors. Information is recorded on the disk 4 in sector units, and this information recording unit is called a block.

FIG. 3 shows an example of allocation of data areas on the erasable optical disk disc 4, most of which is a user area 42 and the remaining area is a spare area 41. The spare area 41 is used for repairing when a defective block occurs in the user area 42.

Perform WAJ on erasable optical discs as described above.
Explain.

First, when the erased ciTi giant optical disk disk 4 is loaded into the optical disk drive device 3, the spare area 41 is read and the I/O disk inside the optical disk control device 2 as shown in FIG.
A replacement management table 5 having address information for establishing correspondence between the replacement area 41 and defective blocks in the user area is created on the C memory.

Next, the initial #recording track A as shown in Fig. 5 fa+
If a bad block B occurs during writing,
In order to rescue the defective block B, 41 volumes of replacement area are written, and the replacement information is registered in the replacement management table 5 (.

By carrying out the processing at the time of 4F writing as described above, when block B becomes defective later when read by the tracker, the replacement management table 5 is searched and the address information of the replacement area corresponding to the defective block is searched. This can be done quickly, and relief using replacement areas can be done efficiently.

Next, the data update operation for track A will be explained.

Data updates to the trunk, including bad block B,
Delete old data and add new data. As a result, if no defective block has occurred, the spare area for block B before data update is deleted as shown in Figure 5+bl, and the registration of the deleted spare area is also deleted from the spare management table 5, and the process ends. do.

The spare area may be erased before new data is written. If a bad block occurs again as a result of data updating, the spare area that is no longer needed is erased, new data is stored in the spare area, and the correspondence management table 5 is updated. Figure 5 (cl) shows an example when the bad block changes from B to C during data update.Also, even though the bad block was busy before the data update, as a result of the data update, the bad block changes from B to C. occurs or the number of bad blocks increases, a new spare area corresponding to the increased number of bad blocks is registered in the write spare area management table 5. FIG. It is a flowchart of update operation.

As explained above, when updating data, a block that was previously considered to be a bad block is also requested to be updated, and if the block becomes a normal block as a result of the data update, the data of the block is updated again and the block is considered to be a bad block. Unless it is determined that the block is normal, it will be treated as a normal block. Therefore, it has the effect of reducing the overall number of bad blocks compared to the case where bad blocks are not reused.
This has the effect of reducing the number of spare areas used and the frequency of access to the spare area.

〔Effect of the invention〕

According to the present invention, since data is updated even for a block that has been determined to be a -degree defective block, if the data of the block can be updated normally, it is reused as a normal block from now on, thereby reducing the increase in the total number of defective blocks. This has the effect of reducing the number of spare areas used and the frequency of access to the spare area.

[Brief explanation of the drawing]

Fig. 1 is an operation flowchart based on the present invention; Fig. 2 is a diagram showing the track format of the optical disk disc; Fig. 3 is a diagram showing the track allocation state of the optical disc disc; Fig. 4 is an alternate Explanatory diagram of the management table, Figure 5 fa),
Ibl, (cl is an explanatory diagram of a data recording system showing an uninvented embodiment, and FIG. 6 is a configuration diagram of an optical disk subsystem. Σ Part 5

Claims (1)

[Claims] 1. A rewritable information recording medium in which each track is divided into a plurality of blocks having unique addresses and has a user data recording area and a replacement recording area for relieving defective blocks in the recording area, and the replacement recording area and In an information recording device that has a correspondence table of address information with defective blocks in the user data recording area and records, reproduces, and erases data on the track, when updating data in the user data area, the defective block before the update is detected. An information recording control method characterized in that data is also updated for blocks, and if the defective block is successfully updated, the block is reused as a normal block from now on.